Grey thigh high boots size 8.5

Grey thigh high boots size 8.5. Stockings and other items not included. Thrifted these boots a few years back so I don’t know a whole lot about them except they are size 8.5 and on the inside sole it appears to say “Roo fashion”. Can go with dresses, jeans, skirts, etc.! The sole is rather light however so they don’t feel as sturdy as other shoes. They also slip down from time to time, not sure if it’s not tight enough at the top for my legs or if that’s just how thigh high boots are🤷‍♀️$35 OBO